Guard for the arms of electric-conductor supports.



G. E. HARRISON & G. BURNS. GUARD FOR THE ARMS OF ELECTRIC CONDUCTOR SUPPORTS. APPLICATION FILED MAY 25, 1908.

914,042. Patented Mar; ,2, 1909.

Uimruu UNITED STATES GEORGE E. HARRISON AND GEORGE BURNS, OFDETROIT,lHICHIGAN' GUARD FOR THE ARMS OF ELECTRIC-CONDUCTOR SUPPORTS.

Specificationb'f Letters Patent.

Patented March 2, 1909.

Applgition filed May 25, 1908. Serial No. 434,840.

To all whom it may concern:

- Be it known that we, GEORGE E. HARRI- SON and GEORGE BL .Ns, citizens of the United States, residing at. Detroit, county of Wayne, State of Michigan, have int-"need a certain new and useful Improvement in Guards for the Arms of Electric-Conductor Supports, and declarefi'the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specifi cation.

This invention relates to sheaths for the arms of electric conductor supports.

It has for its object an improved sheath adapted to be used over an arm, or a part of an arm, on which the lineman may stand, or which he may othcruise con-tact while engaged in .stretching wires or re airing the electric wires stretched over sair arms, and which will rotect the lineman from the electric shoc r incident to such position.

Where lines carrying currents of high tension are stretched over the ordinary glass or porcelain supports, which are mounted on pins, and the pins driven into the arms, there is great liability to more or less severe shocks from induced currents, or from the electricity that leaks from the wires, although the lineman may not come in direct contact with the wire itself. The danger is especially 'pro nounced in damp weather, or after rains, when the arm has become coated with a filni of moisture, and is especially liable to happen when, as is not infrequently the case, the arm has been affected by decay, which may be only in spots, and may be partially covered by paint, and of a character to escape the observation of the workman, but is sufiiciently advanced to cause the partially decayed wood to hold moisture, and thereby become a conductor of electricity to a sufii cient degree to be troublesome, and sometimes dangerous.

The object of this "invention is 'to cover that part of the arm over which, or around which, the workman is employed, with a sheathing of rubber, or other similar nonconductmg material, which is itself dry and which may be easily laced and easily re- "moved after use, but w ich affords a perfect ,and adequate protection to the workman from the. dangerous or troublesome effects referred to. p

In the drawings :Figure 1, is a perspective of a sheath. Fig. 2, is a cross section of a sheath in place on an arm. Fig. 3, indicates the manner of using the sheath.

The sheath is an open ended split tube adapted to engage closely over the arm, and to that end is nearly rectangular in cross section. notches 10 and 11 at the ends, which are adapted to engage closely against the pins 8 and 9 of the insulators proper. From the tread 2 depend hanging walls 3 and 4, which are made to converge or draw in slightly, making the cross distance between the lower edges of the hanging walls 3 and 4 slightly less than the cross distance of the upper edges of these walls. 'At the bottom of each hanging wall is an inturned flange, and the two fianges 5 and G engage under the lower. face of the cross arm 7, when the guard is in position for use. The material, of which the guard is made, is somewhat flexible and re- The tread part 2 is provided with I silient, and thc"botton1 edges of the hanging walls 3 and 4 can be sprung apart to permit of the engagement of the guard over the arm 7; the tread part 2 can be flexed enough to bring the notches 10 and 11 into their proper engagement with the pins 8 and 9. With a guard made of reasonably stifi material, the construction described will sufiice to cause the guard to hold its position firmly enough for practical use. Provision is made, however, by attaching a'strap 12 to one of the flan es 5, and a buckle 13 to the flange 6 to firm y secure the uard in place, if, for any reason, it fails to fit the particular arm with which it is desired to use it. The arms, or electric supports of this character, are at the present time made of a standard size, or two standard sizes, and the arms are spaced on'the pole at a standard distance, and the ins spaced a standard distance, and thereore it is ossible to make the guard of a standard size, or two standard sizes, to corres 0nd.

use the workman generally a ds on one arm of the support and hooks his leg over the next higher arm; this'brings the bottom of one foot onto'an arm, and the lower part of the thi h and the back of the calf against the next igher arm; the shields I a tread part of insulating material members connected with said tread part and In testimony whereof, we sign this speciprovided with inturned flanges, substanfication in the presence of two wltnesses.

tially as described. GEORGE E. HARRISON.

2. A guard for linemens'u se, comprising GEORGE BURNS. 5 a tread part, and side members hangin Witnesses:

therefrom, and means for securing the guar ALEGIA TOWNSEND,

to an arm, substantially as described. I VIRGINIA C. SPRATT. 

